ITech IT8900 Series - USB Interface

References of Load Communication Interfaces
Copyright © ITECH Electronic Co., Ltd. 83
5
GND, grounding
6
No conjunction
7
CTS, clear to send
8
RTS, request to send
9
No conjunction
RS-232 troubleshooting:
In case of connection failure of RS-232, perform following check:
 Check if the computer and load are provided with same Baud rate, parity
check bit, data bit and flow control. The power shall be configured with one
start bit (fixed) and one stop bit (fixed).
 Just as described in the RS-232 connector, correct interface cable or
adapter shall be adopted. Note: even if the cable is equipped with right plug,
internal wiring may be incorrect.
 The interface cable must be connected to the correct serial port (COM1,
COM2, etc.) of the computer.
Setting of communication
Before communication operation, be sure to match load and PC parameters (as
follows).
Baud rate: 9600 (4800/9600/19200/38400/57600/15200). You may enter
system menu through the board to set communication Baud rate.
Data bit: 8 bits
Stop bit: 1 bit
Check: (none, even, odd)
EVEN 8 data bits have even-parity check
ODD 8 data bits have odd-parity check
NONE 8 data bits have no check
Local address: (0-31, factory set value: 0)
Start Bit Parity=None 8 Data Bits Stop Bit
5.2 USB Interface
Connect the load and the computer using a cable with two USB interfaces (each
end). All functions of the load can be programmed via USB.
The functions of load USB488 interface are as follows:
 The interface is 488.2 USB488 Interface.
 The interface receives requests of REN_CONTROL, GO_TO_LOCAL and
LOCAL_LOCKOUT.
 The interface receives the command MsgID=TRIGGER USBTMC and
conveys the TRIGGER command to the functional layer.
The functions of load USB488 device are as follows:
 Capable to read all common SCPI commands.
 SR1 enabled.
 RL1 enabled.
 DT1 enabled.